# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a214935 Showing 1-1 of 1 %I A214935 #26 May 16 2014 05:13:27 %S A214935 1,2,4,9,30,189,217,2225,3385,14357,30802,31545,104071,149689,1094421, %T A214935 1319945,10655462,23163298,112228683,182837804,203615628,486570087, %U A214935 1094330259,11992433550,17883926781,50070452577,52302956123,72178455400 %N A214935 Index of the primes of A205827, A000720(A205827(n)). %C A214935 A000040(a(n)) = A205827(n). %C A214935 With pi(x) being the prime counting function, A000720(x), for n from 1 to 3, a(n) = pi(A111870(n)) = A241542(n), for n from 5 to 28, a(n) = pi(A111870(n-1)) = A241542(n-1). - _John W. Nicholson_, May 10 2014 %H A214935 John W. Nicholson, Table of n, a(n) for n = 1..38 %F A214935 a(n) = pi(A205827(n)) = A000720(A205827(n)). %e A214935 a(4) = 9, A000040(9) = 23, and A205827(4) = 23. %o A214935 (PARI) record=0;i=0;A214935=vectorsmall(38);for(n=1,75,current=(A000101[n]/A002386[n]*1.)^A005669[n];if(current>record,record=current;i++;A214935[i]=A005669[n])) %Y A214935 Cf. A205827. %K A214935 nonn %O A214935 1,2 %A A214935 _John W. Nicholson_, Oct 28 2012 %E A214935 a(13)-a(28) from _Donovan Johnson_, Oct 28 2012 %E A214935 a(29)-a(38) from _John W. Nicholson_, Dec 01 2013 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE